Main Circuit Terminal And Motor Wiring - YASKAWA FSDrive-MV1000 Instructions Manual

3.5 Main Circuit Wiring

◆ Main Circuit Terminal and Motor Wiring

This section outlines the various steps, precautions, and checkpoints for wiring the main circuit terminals and motor
terminals.
Make the input and output terminal connections correctly, checking their codes.
DANGER! Do not touch the input and output terminals directly with your hands and do not bring the input and output wires into
contact with the drive case or metal parts. In addition, do not short circuit the output wires. Incorrect wiring could lead to
death or serious injury by an electric shock or grounding fault.
NOTICE: Connect input terminals U, V and W of the motor to output terminals U, V and W of the drive, pairing the terminal codes. The
phase orders of the motor terminals and drive terminals should also match. The motor may run in reverse if the phase orders
do not match.
NOTICE: Do not connect the AC power line to the output terminals of the drive. Failure to comply could result in death or serious injury
by fire as a result of drive damage.
Precautions on Cable Length Between Drive and Motor
■
Voltage drop along the motor cable may cause reduced motor torque when the wiring between the drive and the motor is
too long. Particular care is required with low frequency output. This can also be a problem when motors are connected in
parallel with a long total cable length. Drive output current will increase as the harmonic leakage current from the cable
increases. An increase in leakage current may trip the drive due to an overcurrent and diminish the current detection
accuracy.
Precautions on Connections Between Drive and Motor
■
Connect the motor lead wires U, V, and W to the drive main circuit output terminals U, V, and W matching their codes.
Confirm that the motor rotates in the forward direction on execution of the forward run command. If the motor rotates in
reverse, check the codes of the drive's output terminals and the motor's input terminals, then switch over any two of the
motor output terminals U, V and W.
When using a motor with a PG, also switch phases-A and -B output signals. And use the cable wire specified by Yaskawa
when connecting the drive and the PG circuit.
■ Precautions on Grounding
Carefully follow the precautions below to correctly ground drives.
WARNING! Electrical Shock Hazard. Use a ground wire of a gauge that complies with the technical standards for electrical
equipment in the country where the drive is being used. Keep the wiring as short as possible. Improper equipment
grounding could cause leakage current to flow to the drive. If so, the potential of the drive's ground terminals becomes
unstable at some distance from the grounding point, resulting in death or serious injury.
WARNING! Electrical Shock Hazard. Always ground the ground terminals. Also be sure to carry out the following grounding work.
Improper equipment grounding could result in death or serious injury by an electric shock through contact with
ungrounded electrical equipment.
• Ground terminals (EA): Grounding resistance of 10 Ω or less
• Control circuits (200 V or less): Grounding resistance of 100 Ω or less
NOTICE: Do not share the ground wire with other devices such as welding machines or large-current electrical equipment. Improper
grounding could result in drive or equipment malfunction.
NOTICE: When using more than one drive, follow the instructions in this manual and ensure that the ground wires do not form a loop.
Improper grounding could result in drive or equipment malfunction.
When using more than one drive, ground them as shown below. Do not loop the ground wire.
Figure 3.9
OK
68
Not
Good
Figure 3.9 Multiple Drive Wiring
YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions